McCarthy, S, Sayers, HM and McKevitt, P (2007) Investigating the usability of PDAs with ageing users. In: Proc. of the 21st British Human Computer Interaction (HCI) Group Conference on People and Computers: HCI...but not as we know it (HCI 2007), University of Lancaster, Lancaster, England. British Computer Society. Vol 2 4 pp. [Conference contribution]